This is the ROM from the C65 (Alan Share's), checksum $caff. The date on boot
up is 910111. The ROM date (at the beginning) is 910110. A bit modified
character set at $9000, with taller b and d letters, for instance. Normal
characters at $D000.

This is the ROM from a C65 (Thomas Hechelhammer's), checksum $4bcf.
The date on boot up is 911001.
The ROM date (at the beginning) is 911008.
The character sets are the same as in the 910111 ROM. There is a
BASIC program stored at $4000. This must have been in a firmware
developer's machine.